About Langfuse

• Open Source LLM Engineering Platform that helps teams build useful AI applications via tracing, evaluation, and prompt management (mission, product)

• We have the chance to build the "Datadog" of this category; model capabilities continue to improve but building useful applications is really hard, both in startups and enterprises

• Largest open source solution in this category: >2k customers, >14M monthly SDK downloads, >6M docker pulls

• We raised money from world class investors (Y-Combinator, Lightspeed, General Catalyst) and are default alive by making more money than we spend

• We're a small, engineering-heavy, and experienced team in Berlin and San Francisco (how we work)

About the Role

In Short: We're looking for an experienced product engineer to help us scale our platform as we grow.

What you'll do

• Do whatever it takes to build new features for our users. For this you are not afraid to touch FE, BE, SDKs or Docs

• You love to communicate with users on a call or in one of our hundreds of slack channels

• You will come up with a plan on how to build the next big feature at Langfuse and execute on it

• Doing support

• Writing docs

Tech Stack

You should be familiar with a majority of these but we trust that you can pick up a new language/framework quickly.

• See full stack here

• Lear about our architecture

What we're looking for

• Someone who is able to PM and project manage themselves

• Experience building highly reliable, scaling infrastructure

• Interest in open source software and talking to users

• Hard worker who thrives in a small, accountable team

• CS or quantitative degree preferred

• Impressive achievements (professional or otherwise)

Bonus points:

• Former founder

• Experience in SDK design

• DX, ML/AI background

Why Langfuse?

• Building for very sophisticated technical users

• Competitive salary & equity compensation

• Strong customer & revenue growth

• You are still joining really early

• Strong in person engineering culture (Berlin-Mitte)

• Extreme autonomy

• Performance and learning focused culture

• Everyone on the team says: "best place I've ever worked at"

• 2 short scheduled meetings per week

Process

We can run this process to offer in less than 7 days.

1. Fill out application

2. We screen your application

3. Jump on a intro call with our CTO

4. Technical Deep Dive interview

5. Super Day ( half or full day in Berlin Office )

6. Meet the other founders (short calls)

7. Decision & Offer

Links

• Project you could have built: Infrastructure Evolution Blog Post

• Our codebase: GitHub Repository

• Ben Kuhn on Impact, Agency and Taste

• Who we are & how we work

• What is a Product Engineer (PostHog)